hi my bike dies under pressure revs fine on stand but as soon as under stress cuts out ( almost as if theres no fuel ) was told to change crank seals ..a week of my bike off road and now its still no better .....any help would be great

chris, June 2011

will do rayb , away this weekend but will keep you posted .also googled problem and think it could be something to do with main jet ! ! you did mention that .A new exhaust was put on by previous owner but not sure if they upped the jet so will check that to . many thanks I,ll post again next week next week

chris, June 2011

hi chris. try checking reed valves for wear.they are under the inlet manifold.

rayb, June 2011

thanks for advice rayb , my son has same model ( but working ! ! ) so iv,e switched carb , ht lead unit and regulator / rectifier . I have spark but to get it started especially from cold i have to cover the air intake (Carb) with my hand once warm it ticks over fine ! ! this problem is constant (regardless of all the swapping of proven parts) and driving me mad , as i said it dies under pressure ,i checked piston rings when i was doing crank seals and thier within the tolerance any more advice would be great

chris, June 2011

thanks for advice rayb , my son has same model ( but working ! ! ) so iv,e switched carb , ht lead unit and regulator / rectifier . I have spark but to get it started especially from cold i have to cover the air intake (Carb) with my hand once warm it ticks over fine ! ! this problem is constant (regardless of all the swapping of proven parts) and driving me mad , as i said it dies under pressure ,i checked piston rings when i was doing crank seals and thier within the tolerance any more advice would be great

chris, June 2011

check main jet for blockage.

rayb, June 2011